2006

6.1

2007

6.7

2007

6.7

1998

7.3

2002

5.9

2005

5.1

1982

7.8

2003

7.1

2009

6.0

2008

4.9

1991

6.3

2009

4.2

1999

5.7

1993

6.9

1999

6.0

1987

6.7

2001

6.0

1977

6.2

1993

6.4

1994

6.0